<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        //console.log((1/3)===(1-2/3));
        console.log(Math.abs((1/3)-(1-2/3))<0.000001);
        //为了保证代码的可读性，尽量使用[]
        var arr = [1,2,3,'hello',null,true];
        new Array(1,2,3,'hello',null,true);
        var person = {
            name: "David Niu",
            age: 3,
            tags: ['js','java','web','...']
        }
    </script>


</head>
<body>

</body>
</html>